Yan Zhang , Yanrong Xu , Xiuli Su , Haihong Zhang , Xiaowei Feng , Xiaolong Wei
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引用次数: 0
Abstract
This study investigates the effect of water erosion on the adhesion between rubber modified asphalt and aggregates, evaluating the moisture damage resistance of asphalt mixtures in solutions with varying pH. This study examined the adhesion between rubber modified asphalt and four aggregates: granite, basalt, class A limestone, and class B limestone. Adhesion forces were measured using atomic force microscopy (AFM) in 1 mmol/L potassium chloride solutions at pH 2, 4, 6, 8, and 10. Based on the Zeta potential values of asphalt and aggregate surfaces, interaction forces were calculated using the Derjaguin-Landau-Verwey-Overbeek (DLVO) theory and compared with experimental results. The adhesion strength was highest for limestone, followed by basalt, and lowest for granite. The measured long-range forces (LRF) were lower under acidic conditions, while adhesive forces were higher in alkaline environments, suggesting better moisture damage resistance in acidic media. The LRF curves aligned well with DLVO-calculated values, confirming the theory's applicability to asphalt-aggregate interactions. In addition, molecular dynamics simulations of the microscopic forces between asphalt and aggregates showed consistency with AFM results. This study elucidates microscale adhesion mechanisms in aqueous environments and offers guidance for improving moisture resistance in rubber modified asphalt pavements.
期刊介绍:
The International Journal of Adhesion and Adhesives draws together the many aspects of the science and technology of adhesive materials, from fundamental research and development work to industrial applications. Subject areas covered include: interfacial interactions, surface chemistry, methods of testing, accumulation of test data on physical and mechanical properties, environmental effects, new adhesive materials, sealants, design of bonded joints, and manufacturing technology.